| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_ca6955d9a550c473765e51a2b346db2d
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1156bb0732d51d7efabbf21f71e2ff9e |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G2650-34 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G63-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D323-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G63-78 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-91
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-78
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-06
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D323-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07B61-00 |
| filingDate |
2004-04-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0a072ea184c8bc2473d849840d8ea2ea
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_62fd969d0359c2315ac40f8d8bb15242
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bdcb940afcba4937cdd23f82d8efe4f7
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ca081d94e2a3dd481d7019162a7c297c |
| publicationDate |
2005-01-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
TW-200500353-A |
| titleOfInvention |
Method for producing cyclic lactic acid oligomer |
| abstract |
This invention provides a method for producing cyclic lactic acid oligomer having desired condensation degree more effectively. In the presence of phosphine, the terminal carboxyl group of the a chain m oligomer of lactic acid (m is an integer of 3 to 15) as a starting material is reacted with compound RSSR'(R and R' are same or different, each respectively represents cyclic or chain organic group) at -100℃ to room temperature, then the n molecules of said oligomers is subject to cyclization reaction, in the presence of catalyst to cyclize n molecules of the oligomers at the terminal carboxy group there of. The condensation degree of the said cyclic lactic acid is controlled by the condensation degree of the starting chain m oligomer of lactic acid, and the product with n-fold of m oligomer is obtained. The product is generally a mixture of (m x n) oligomers (I.e., oligomer having m x n molecules of lactic acid units). |
| priorityDate |
2003-04-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |